08/11/2018 NICC Standards LimitedNICC Standards Limited
NICC DSL TG
NICC DSL Task Group
A(nother) year in review
Kevin Foster CEng. FIETNICC DSL Task Group Chairman
7 November 2018
08/11/2018 NICC Standards LimitedNICC Standards Limited
Outline
● NICC DSL TG Scope
● Participants, meetings and working methods
● DSL TG work programme review
– Completed
– In pipeline
● Summary
08/11/2018 NICC Standards LimitedNICC Standards Limited
DSL TG scope
Specifications and guidelines relating to Digital Subscriber Line technology in the unbundled UK metallic access network
– BT
– KCOM
Radialdistribution
Exchange
Exchangemanhole
MDF
PCP SCP
Underground cable
E-Side D-Side
DP
Overheaddistribution
Key documents are the Access Network Frequency Plans and
Metallic Path Facility specifications and guidelines
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DSL TG meetings
● 12 meetings since the last Open Forum
– 3 Face-to-face meetings hosted by a NICC member
– 9 Teleconferences
Operators/CPs Equipment/chip vendor Other organisations
BT Group (inc. Openreach) ASSIA Ofcom
Sky ECI
Talk-Talk Huawei
Vodafone Intel
Nokia
Sckipio
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Work plan
Work
Item #
Description Target ND Status
321
Overlapping spectrum
study and change to BT
ANFP and BT ANFP
Guidelines
Study report
ND1520 and then
uplift
ND1602 and
ND1405
Complex study work completed
looking at technical options for
giving more low-frequency
spectrum to G.fast whilst limiting
impact to VDSL2
Contributions/ Editing
1st stable draft
TG approvalNICC
consensus approval
Publication
ND1602 (BT ANFP) ND1520
12
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● Operation of G.fast below 17.7MHz in VDSL spectrum
● Published July 2018
● This document summarises the most practical options to enable the use of a lower start frequency for G.fast, below the 19MHz currently specified in V6 of the ANFP [1] and how those options meet the caveats from the work item on the implementation of such options. Each option includes PSDs and control methods. The scope includes those frequencies where there is currently exclusive use by VDSL systems. Frequencies below 2.2MHz are not used by G.fast and are out of scope.
ND1520 published
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● Operation of G.fast below 17.7 MHz in VDSL spectrum
● Many methods and cases of operation of G.fast below 17.7 MHz in VDSL spectrum identified that benefit G.fast performance, although some cases sometimes impact existing VDSL performance.
● Use cases, technical options, control impacts, network models, quantitative simulation analyses; all analysed in detail and summarised.
ND1520 overview
VDSL
frequency
ND1520
G.fast
split frequency
VDSL G.fast
17.7 MHz 19 MHz
Unused /
unneeded
frequency
Pre-existing
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● Detailed comparisons of all options
1. No change to existing ANFP
2. Static overlapping
3. Re-farming; static re-assignment of high frequencies from VDSL to G.fast
4. Variable split frequency; allow G.fast to use high frequencies on long loops unused by VDSL
5. Variable split frequency per line (dynamic)
● Options 3-5 offered attractive G.fast performance increases with varying complexities
– Option 2 had too many problems!
ND1520 technical options
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Outlook for 2019
Update the BT ANFP to V7 for increased rate/reach for G.fast and LR-VDSL
(ND1602)
Update the BT ANFP guidelines
(ND1405)
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● The NICC DSL TG has been very active on G.fast and VDSL
spectrum considerations
– Good levels of participation; operators, vendors and Ofcom
● The study on technical options was completed (ND1520)
● Currently working on changes to BT ANFP (ND1602) to enable
increased rate/reach for G.fast and LR-VDSL
– Expect to publish V7 of BT ANFP during March 2019
● Work will then commence on uplifting the Guidelines (ND1405)
– Expect to publish Guidelines during September 2019
Summary